I think we now know that some people really like the camera and some don't see the need lol.
Why is it so expensive now? I think it was something like £150 when I specced mine, and at that price, it was worth it just for the badge to pop out when I reversed
'er indoors has just got a new Nissan Qashqui and that's got quite a good system - it's got camera's front and rear and one in the underside of each mirror. When you reverse it puts up 2 images on the screen, from the reverse camera and a composite that gives the effect of looking at the car from above. If you then go forward (or press the 'camera' button on the dash, you can have the front camera and plan view.
It takes a bit of getting used to and the infotainment system is a little (ok, a lot) clunky even compared to my 2014 MIB1 CMS but it's quite good for getting in the middle of a parking space as you can see the lines both sides on the plan view.